package com.vows.test;

/**
 * who care
 * Created by jazzy on 2017/7/26.
 */
public class StringTest2 {
    public static void main(String[] args) {
        String s1="hello";
        String s2="world";
        change(s1,s2);
        //s2=s1+s2;
        System.out.println(s1+"    "+s2);

        StringBuffer sb1 = new StringBuffer("hello");
        StringBuffer sb2 = new StringBuffer("world");
        change(sb1,sb2);
        System.out.println(sb1+"   "+sb2);
    }

    public static void change(String s1,String s2){
        s1=s2;
        s2=s1+s2;
    }
    public static void change(StringBuffer sb1 ,StringBuffer sb2){
        sb1=sb2;
        sb2.append(sb1);
    }
}
